Headstock for guitar



FIG. 1 is a front and right side perspective view of a headstock for a guitar showing my new design, with a guitar shown in broken lines for purposes of illustration only and forming no part of the claimed design;

FIG. 2 is a front elevational view of the headstock;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for the headstock for guitar, substantially as shown and described. 